* { padding:0; margin:0;}       /*设置所有对像的内边距为0*/
body { text-align:center;}      /*设置页面居中对齐*/
#photo-list {
    cursor:move;
    width:600px;
    height:300px;
    margin:50px auto;
    overflow:hidden;
    border:2px solid #333;
}
#photo-list ul {list-style:none;width:3600px;height:300px;}
#photo-list li {float:left;}
#photo-list img {background:#fff; }